How severe is CVE-2025-58767?

No CVSS score has been assigned to CVE-2025-58767 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2025-58767?

CVE-2025-58767 affects the following packages: rexml (RubyGems). Ecosystems affected: RubyGems.

How do I fix CVE-2025-58767?

Update rexml to 3.4.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-58767 is resolved across your whole dependency graph.

How do I detect CVE-2025-58767 in my RubyGems dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rexml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-58767 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2025-58767 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-58767 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-58767?

CVE-2025-58767 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 16th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-58767?

CVE-2025-58767 is classified as Uncontrolled Resource Consumption (CWE-400). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-58767 published, and has it been updated?

CVE-2025-58767 was published on September 17, 2025 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎 RubyGems

Not in CISA KEV

CVE-2025-58767 — rexml

Fix: ruby/rexml@5859bde

CVE-2025-58767 is a Uncontrolled Resource Consumption vulnerability in rexml. A fix is available for rexml — see the affected versions and patch details below.

REXML has a DoS condition when parsing malformed XML file

Also known asGHSA-c2f4-jgmc-q2r5

Published

Sep 17, 2025

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-58767.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs16th percentile — riskier than 16% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

💎rexml

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

Impact

The REXML gems from 3.3.3 to 3.4.1 have a DoS vulnerability when parsing XML containing multiple XML declarations. If you need to parse untrusted XMLs, you may be impacted to these vulnerabilities.

Patches

REXML gems 3.4.2 or later include the patches to fix these vulnerabilities.

Workarounds

Don't parse untrusted XMLs.

References

https://www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767/ : An announcement on www.ruby-lang.org

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`rexml`	≥ 3.3.3&&< 3.4.2	3.4.2`bundle update rexml --conservative`

Affected Products

1 product · 1 configurations

Application

rexmlruby-lang

≥ 3.3.3 && < 3.4.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rexml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update rexml to 3.4.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-58767 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Red Hat Product Security team has rated this vulnerability as having the 'Moderate' severity, with the final CVSSv3.1 score of 5.3 as the final impact in availability is restricted to the application consuming the REXML package and not the whole system.

Workaround published by Red Hat

The primary mitigation for this flaw is to avoid parsing XML documents originating from untrusted, unauthenticated, or unverified sources.

Source: Red Hat security advisory for CVE-2025-58767 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Enterprise Linux 10	`ruby-0:3.3.10-11.el10_1`	RHSA-2025:23141
Red Hat Enterprise Linux 10.0 Extended Update Support	`ruby-0:3.3.10-11.el10_0`	RHSA-2025:23927
Red Hat Enterprise Linux 8	`ruby:3.3-8100020251124151715.489197e6`	RHSA-2025:23062
Red Hat Enterprise Linux 9	`ruby:3.3-9070020251113101221.9`	RHSA-2025:23063
Red Hat Enterprise Linux 9.4 Extended Update Support	`ruby:3.3-9040020251203142310.9`	RHSA-2025:23140
Red Hat Enterprise Linux 9.6 Extended Update Support	`ruby:3.3-9060020251210162455.9`	RHSA-2025:23648

Frequently Asked Questions

### Impact The REXML gems from 3.3.3 to 3.4.1 have a DoS vulnerability when parsing XML containing multiple XML declarations. If you need to parse untrusted XMLs, you may be impacted to these vulnerabilities. ### Patches REXML gems 3.4.2 or later include the patches to fix these vulnerabilities. ### Workarounds Don't parse untrusted XMLs. ### References * https://www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767/ : An announcement on www.ruby-lang.org

O3 Security · Impact-Aware SCA

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